diff options
| -rw-r--r-- | udev-acl/usbdev_id.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/udev-acl/usbdev_id.c b/udev-acl/usbdev_id.c index 5caeb97..4bf5b9e 100644 --- a/udev-acl/usbdev_id.c +++ b/udev-acl/usbdev_id.c @@ -49,8 +49,10 @@ static int devinfo(const char *syspath) strcat(filename, syspath); strcat(filename, "/descriptors"); fd = open(filename, O_RDONLY); - if (fd < 0) + if (fd < 0) { + fprintf(stderr, "error opening USB device 'descriptors' file\n"); return -1; + } size = read(fd, buf, sizeof(buf)); close(fd); if (size < 18 || size == sizeof(buf)) @@ -77,8 +79,10 @@ int main(int argc, char *argv[]) { const char *devpath = argv[1]; - if (devpath == NULL) + if (devpath == NULL) { + fprintf(stderr, "Usage: usbdev_id <devpath>\n"); return 1; + } devinfo(devpath); return 0; } |